Looks like it�s about to be pulled from the next kernel
release (6.1).
Yeah, that's been coming for a while. DECnet support is already a separate,
loadable kernel module, but things in the kernel change all the time (and sometimes
gratuitously, I think). Without somebody keeping the DECnet module up to date, it would
quit working in short order. Nobody wanted the job.
ZITI runs Ubuntu 16.04 LTS with ESM and it's a fairly old kernel - 4.4 something.
Looking thru my notes it seems like I tried to run John's Raspbian build on it before,
in the summer of 2020, and ran into a few problems. I'll pull the latest version over
the holiday and try it again.
Bob